<?php

/**
 * This is the model class for table "tbl_post".
 *
 * The followings are the available columns in table 'tbl_post':
 * @property integer $id
 * @property string $title
 * @property string $content
 * @property string $tags
 * @property integer $status
 * @property integer $create_time
 * @property integer $update_time
 * @property integer $author_id
 *
 * The followings are the available model relations:
 * @property Comment[] $comments
 * @property User $author
 */
class Post extends CActiveRecord
{
    const STATUS_DRAFT=1;
    const STATUS_PUBLISHED=2;
    const STATUS_ARCHIVED=3;

    public function getUrl()
    {
        return Yii::app()->createUrl('post/view', array(
            'id'=>$this->id,
            'title'=>$this->title,
        ));
    }
    /**
     * @return string the associated database table name
     */
    public function tableName()
    {
        return 'tbl_post';
    }

    /**
     * @return array validation rules for model attributes.
     */
    public function rules()
    {
        // NOTE: you should only define rules for those attributes that
        // will receive user inputs.
        return array(
            array('title, content, status', 'required'),
            array('title', 'length', 'max'=>128),
            array('status', 'in', 'range'=>array(1,2,3)),
            array('tags', 'match', 'pattern'=>'/^[\w\s,]+$/', 'message'=>'Tags can only contain word characters.'),
            array('tags', 'normalizeTags'),
            array('title, status', 'safe', 'on'=>'search'),
        );
    }

    public function normalizeTags($attribute,$params)
    {
        $this->tags=Tag::array2string(array_unique(Tag::string2array($this->tags)));
    }
    /**
     * @return array relational rules.
     */
    public function relations()
    {
        // NOTE: you may need to adjust the relation name and the related
        // class name for the relations automatically generated below.
        return array(
            'author' => array(self::BELONGS_TO, 'User', 'author_id'),
            'comments' => array(self::HAS_MANY, 'Comment', 'post_id',
            'condition'=>'comments.status='.Comment::STATUS_APPROVED,
            'order'=>'comments.create_time DESC'),
            'commentCount' => array(self::STAT, 'Comment', 'post_id',
            'condition'=>'status='.Comment::STATUS_APPROVED),
        );
    }

    /**
     * @return array customized attribute labels (name=>label)
     */
    public function attributeLabels()
    {
        return array(
            'id' => 'ID',
            'title' => 'Title',
            'content' => 'Content',
            'tags' => 'Tags',
            'status' => 'Status',
            'create_time' => 'Create Time',
            'update_time' => 'Update Time',
            'author_id' => 'Author',
        );
    }

    /**
     * Retrieves a list of models based on the current search/filter conditions.
     *
     * Typical usecase:
     * - Initialize the model fields with values from filter form.
     * - Execute this method to get CActiveDataProvider instance which will filter
     * models according to data in model fields.
     * - Pass data provider to CGridView, CListView or any similar widget.
     *
     * @return CActiveDataProvider the data provider that can return the models
     * based on the search/filter conditions.
     */
    public function search()
    {
        // @todo Please modify the following code to remove attributes that should not be searched.

        $criteria=new CDbCriteria;

        $criteria->compare('id',$this->id);
        $criteria->compare('title',$this->title,true);
        $criteria->compare('content',$this->content,true);
        $criteria->compare('tags',$this->tags,true);
        $criteria->compare('status',$this->status);
        $criteria->compare('create_time',$this->create_time);
        $criteria->compare('update_time',$this->update_time);
        $criteria->compare('author_id',$this->author_id);

        return new CActiveDataProvider($this, array(
            'criteria'=>$criteria,
        ));
    }

    /**
     * Returns the static model of the specified AR class.
     * Please note that you should have this exact method in all your CActiveRecord descendants!
     * @param string $className active record class name.
     * @return Post the static model class
     */
    public static function model($className=__CLASS__)
    {
        return parent::model($className);
    }

    protected function beforeSave()
    {
        if(parent::beforeSave())
        {
            if($this->isNewRecord)
            {
                $this->create_time=$this->update_time=time();
                $this->author_id=Yii::app()->user->id;
            }
            else
                $this->update_time=time();
                return true;
            }
        else
            return false;
    }

    protected function afterSave()
    {
        parent::afterSave();
        Tag::model()->updateFrequency($this->_oldTags, $this->tags);
    }
     
    private $_oldTags;
     
    protected function afterFind()
    {
        parent::afterFind();
        $this->_oldTags=$this->tags;
    }
    
    protected function afterDelete()
    {
        parent::afterDelete();
        Comment::model()->deleteAll('post_id='.$this->id);
        Tag::model()->updateFrequency($this->tags, '');
    }
}
